add admin page to copy files from USB drive

[on7lds]

Adds extra page in admin mode.
This page will show the connected USB drive(s), the user selects the wanted drive and then can start the copy.
All files from the filder 'Pi-Star' on the selected disk will be copied to /usr/local/etc (if the total is less than 32MB)
Destination dir and folder size are variables that can be changed in the code

[AndyTaylorTweet]

Help me to understand why this feature is needed, we can already backup and restore the config(s) from the dashboard.

[on7lds]

Many hotspot users are building Nextion screens which provide extra data.
This way, files with these data (like group names, user QTH, ...) or Nextion screen definition files can be transferred without knowledge of ssh, or scp.

If it would be OK for you, I also would like to incorporate (the choice to activate) NextionDriver in the future, which provides these extras to the screen and which gives the ability to users to program touch buttons on their screens e.g. to power down, load a new display definition file or -maybe later- to switch on/off modes from the screen (e.g. when no PC is available to do this and since the dashboard is not responsive)

[phl0]

@on7lds +1 for the Nextion idea :)